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    16,361Registered studies name a cognitive test in an outcome measure11,688 name a test you can run hereExplore the studies
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  1. Home
  2. /Data
  3. /Clinical trials
  4. /Conditions
  5. /Anxiety, PTSD and OCD
  6. /Trail Making Test

Clinical trials data

Trail Making Test in anxiety, PTSD and OCD trials: 69 registered studies

Every registered anxiety, PTSD and OCD study on ClinicalTrials.gov that names the Trail Making Test in an outcome measure: how often it is a primary outcome, the tests named with it, how large the studies are and when they measure it.

Registered anxiety, PTSD and OCD studies name it in an outcome measure
69
Name it in a primary outcome, 35%
24 of 69
Of the condition's 692 studies name it, against 14% of all registered studies
10%
Other conditions
Median participants per study
67
By phase
Try Trail Making Test ATry Trail Making Test B

Tests named in the same studies

The library tests that anxiety, PTSD and OCD studies naming the Trail Making Test name most often beside it.
  1. 1

    Digit Span Test30 studies, 13 as a primary outcome

  2. 2

    Verbal Fluency27 studies, 13 as a primary outcome

  3. 3

    Verbal Learning22 studies, 10 as a primary outcome

  4. 4

    Stroop Color-Word Test22 studies, 6 as a primary outcome

  5. 5

    Symbol Coding12 studies, 6 as a primary outcome

  6. 6

    Category Fluency8 studies, 5 as a primary outcome

  7. 7

    Continuous Performance Test8 studies, 5 as a primary outcome

  8. 8

    Card Sorting Test (Berg)7 studies, 3 as a primary outcome

  9. 9

    Letter-Number Sequencing Task7 studies, 3 as a primary outcome

  10. 10

    N-Back Task5 studies, 2 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Studies by start year

Each study counted once. 2026 is partly planned starts.
02000: 0 studies, 0 with a test as a primary outcome20002001: 0 studies, 0 with a test as a primary outcome2002: 0 studies, 0 with a test as a primary outcome2003: 0 studies, 0 with a test as a primary outcome2004: 0 studies, 0 with a test as a primary outcome2005: 0 studies, 0 with a test as a primary outcome20052006: 0 studies, 0 with a test as a primary outcome2007: 0 studies, 0 with a test as a primary outcome2008: 1 studies, 0 with a test as a primary outcome2009: 1 studies, 0 with a test as a primary outcome2010: 1 studies, 0 with a test as a primary outcome20102011: 3 studies, 1 with a test as a primary outcome2012: 3 studies, 1 with a test as a primary outcome2013: 1 studies, 1 with a test as a primary outcome2014: 0 studies, 0 with a test as a primary outcome2015: 3 studies, 3 with a test as a primary outcome20152016: 2 studies, 1 with a test as a primary outcome2017: 6 studies, 1 with a test as a primary outcome2018: 7 studies, 3 with a test as a primary outcome2019: 4 studies, 2 with a test as a primary outcome2020: 4 studies, 1 with a test as a primary outcome20202021: 10 studies, 2 with a test as a primary outcome2022: 1 studies, 0 with a test as a primary outcome2023: 8 studies, 3 with a test as a primary outcome2024: 6 studies, 3 with a test as a primary outcome2025: 4 studies, 1 with a test as a primary outcome20252026: 4 studies, 1 with a test as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

Show as a table
Registered studies by start year
Start yearStudiesA test as a primary outcome
200000
200100
200200
200300
200400
200500
200600
200700
200810
200910
201010
201131
201231
201311
201400
201533
201621
201761
201873
201942
202041
2021102
202210
202383
202463
202541
202641

Phases and study sizes

By phase

  • Early phase 13 studies, 1 as a primary outcome
  • Phase 210 studies, 1 as a primary outcome
  • Phase 2/31 studies, 0 as a primary outcome
  • Phase 34 studies, 0 as a primary outcome
  • Phase 41 studies, 0 as a primary outcome
  • Not applicable44 studies, 18 as a primary outcome
  • Observational6 studies, 4 as a primary outcome

Participants per study

102050100
  • Not applicable62 median, 30 to 96
Participants per study. The bar spans the middle half of the studies in each phase, the mark is the median, and the axis is logarithmic. Phases with fewer than 10 studies that give a size are left out.
Show as a table
Participants per anxiety, PTSD and OCD study that names the Trail Making Test, by phase
PhaseStudies with a sizeMedianMiddle half
Not applicable446230 to 96

When anxiety, PTSD and OCD trials measure it

Half of the primary outcomes that name the Trail Making Test are measured within 13 weeks of the start, and the middle half from 5 weeks to 6 months. 21 primary outcomes give a duration.

Latest time point of each outcome

  • Within a day9 outcomes, 1 as a primary outcome
  • Up to 4 weeks12 outcomes, 4 as a primary outcome
  • 1 to 3 months24 outcomes, 7 as a primary outcome
  • 3 to 6 months13 outcomes, 6 as a primary outcome
  • 6 to 12 months4 outcomes, 2 as a primary outcome
  • 1 to 2 years1 outcomes, 1 as a primary outcome
  • Over 2 years1 outcomes, 0 as a primary outcome
  • No duration given5 outcomes, 3 as a primary outcome

A test as a primary outcomeOnly in secondary or other outcomes

64 of the 69 outcome measures give a duration. A single visit counts as within a day.

Status, results, interventions and countries

Status

  • Recruiting12 studies, 4 as a primary outcome
  • Not yet recruiting2 studies, 0 as a primary outcome
  • Active, not recruiting2 studies, 1 as a primary outcome
  • Completed34 studies, 15 as a primary outcome
  • Stopped early8 studies, 1 as a primary outcome
  • Status unknown11 studies, 3 as a primary outcome

What they test

  • Behavioral31 studies, 14 as a primary outcome
  • Drug18 studies, 3 as a primary outcome
  • Device11 studies, 3 as a primary outcome
  • Dietary supplement3 studies, 1 as a primary outcome
  • Diagnostic test1 studies, 1 as a primary outcome
  • Radiation1 studies, 1 as a primary outcome
  • Other10 studies, 3 as a primary outcome
  • None given2 studies, 1 as a primary outcome

Intervention types as registered. A study can list several; observational studies often list none.

Where their sites are

  • United States27 studies, 7 as a primary outcome
  • Canada11 studies, 4 as a primary outcome
  • China3 studies, 2 as a primary outcome
  • Spain3 studies, 2 as a primary outcome
  • Denmark2 studies, 1 as a primary outcome
  • France2 studies, 0 as a primary outcome
  • Ireland2 studies, 0 as a primary outcome
  • Portugal2 studies, 1 as a primary outcome
  • Taiwan2 studies, 0 as a primary outcome
  • Hong Kong1 studies, 0 as a primary outcome
  • Hungary1 studies, 0 as a primary outcome
  • Israel1 studies, 0 as a primary outcome

20 countries in all. A study with sites in several counts in each; 4 list no site.

Reported results

Completed studies with results posted on ClinicalTrials.gov, a results paper the registry links to the study, or both.

Completed anxiety, PTSD and OCD studies that name the Trail Making Test: 15 of 34, 44%

Every completed study with a cognitive outcome: 3,626 of 7,953, 46%

Completed anxiety, PTSD and OCD studies that name the Trail Making Test and every completed study, by how they reported results
ResultsCompleted anxiety, PTSD and OCD studies that name the Trail Making TestEvery completed study
Results on ClinicalTrials.gov and a paper3, 9%776, 10%
Results on ClinicalTrials.gov only8, 24%1,139, 14%
A results paper only4, 12%1,711, 22%
Neither19, 56%4,327, 54%

The 69 studies

Filter by phase, sponsor, status, country, intervention, outcome list, size and start year. Each study links to its record on ClinicalTrials.gov.
ConditionAnxiety, PTSD and OCD
TestThe Trail Making Test

69 studies match. 24 name the Trail Making Test in a primary outcome. Median size 67 participants. Median time to the primary outcome: 13 weeks.

Loading 69 studies; the filters turn on when they arrive.

By start year
02.557.5102000: 0 studies, 0 naming the Trail Making Test in a primary outcome20002001: 0 studies, 0 naming the Trail Making Test in a primary outcome2002: 0 studies, 0 naming the Trail Making Test in a primary outcome2003: 0 studies, 0 naming the Trail Making Test in a primary outcome2004: 0 studies, 0 naming the Trail Making Test in a primary outcome2005: 0 studies, 0 naming the Trail Making Test in a primary outcome20052006: 0 studies, 0 naming the Trail Making Test in a primary outcome2007: 0 studies, 0 naming the Trail Making Test in a primary outcome2008: 1 studies, 0 naming the Trail Making Test in a primary outcome2009: 1 studies, 0 naming the Trail Making Test in a primary outcome2010: 1 studies, 0 naming the Trail Making Test in a primary outcome20102011: 3 studies, 1 naming the Trail Making Test in a primary outcome2012: 3 studies, 1 naming the Trail Making Test in a primary outcome2013: 1 studies, 1 naming the Trail Making Test in a primary outcome2014: 0 studies, 0 naming the Trail Making Test in a primary outcome2015: 3 studies, 3 naming the Trail Making Test in a primary outcome20152016: 2 studies, 1 naming the Trail Making Test in a primary outcome2017: 6 studies, 1 naming the Trail Making Test in a primary outcome2018: 7 studies, 3 naming the Trail Making Test in a primary outcome2019: 4 studies, 2 naming the Trail Making Test in a primary outcome2020: 4 studies, 1 naming the Trail Making Test in a primary outcome20202021: 10 studies, 2 naming the Trail Making Test in a primary outcome2022: 1 studies, 0 naming the Trail Making Test in a primary outcome2023: 8 studies, 3 naming the Trail Making Test in a primary outcome2024: 6 studies, 3 naming the Trail Making Test in a primary outcome2025: 4 studies, 1 naming the Trail Making Test in a primary outcome20252026: 4 studies, 1 naming the Trail Making Test in a primary outcome

2026 is partly planned starts.

Show as a table
Matching studies by start year
Start yearStudiesAs a primary outcome
200000
200100
200200
200300
200400
200500
200600
200700
200810
200910
201010
201131
201231
201311
201400
201533
201621
201761
201873
201942
202041
2021102
202210
202383
202463
202541
202641

Library tests named most

  • Trail Making Test69 studies, 24 as a primary outcome
  • Digit Span Test30 studies, 13 as a primary outcome
  • Verbal Fluency27 studies, 13 as a primary outcome
  • Verbal Learning22 studies, 10 as a primary outcome
  • Stroop Color-Word Test22 studies, 6 as a primary outcome
  • Symbol Coding12 studies, 6 as a primary outcome
  • Category Fluency8 studies, 5 as a primary outcome
  • Continuous Performance Test8 studies, 5 as a primary outcome
  • Card Sorting Test (Berg)7 studies, 3 as a primary outcome
  • Letter-Number Sequencing Task7 studies, 3 as a primary outcome

Largest condition groups

  • Anxiety, PTSD and OCD69 studies, 24 as a primary outcome
  • Depression and bipolar disorder29 studies, 12 as a primary outcome
  • Pain and fatigue11 studies, 5 as a primary outcome
  • Sleep and sleep disorders7 studies, 4 as a primary outcome
  • Cancer6 studies, 3 as a primary outcome
  • Substance use and addiction5 studies, 1 as a primary outcome
  • Brain injury and concussion3 studies, 2 as a primary outcome
  • Mild cognitive impairment2 studies, 2 as a primary outcome
  • COVID-19 and long COVID2 studies, 1 as a primary outcome
  • Delirium, surgery and intensive care2 studies, 0 as a primary outcome
  • Cardiovascular disease2 studies, 1 as a primary outcome
  • ADHD1 study, 0 as a primary outcome

Phases

Participants

Lead sponsor: industry 4, NIH 1, other 64. Interventional 63, observational 6.

As a primary outcomeSecondary or other outcomeThe Trail Making Test

The studies, newest registration first

Each number opens the study's record on ClinicalTrials.gov.

Registered studies that match the filters, newest registration first, with the library tests each one names and the outcome list that names them.
StudyStartPhaseConditionsParticipantsLead sponsorStatusLibrary tests named, with the latest time point
NCT07765355Start2025PhaseNot applicableConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants60Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary4 weeks
  • Digit Span TestSecondary4 weeks
NCT07755839Start2026PhaseNot applicableConditionsDepression and bipolar disorder, Cancer, Anxiety, PTSD and OCDParticipants60Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Verbal FluencySecondary6 months
  • Digit Span TestSecondary6 months
  • Cancellation TestSecondary6 months
NCT07735910Start2026PhaseNot applicableConditionsMild cognitive impairment, Depression and bipolar disorder, Sleep and sleep disorders, Anxiety, PTSD and OCDParticipants60Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary2 weeks
  • Stroop Color-Word TestPrimary2 weeks
  • Digit Span TestPrimary2 weeks
NCT07665840Start2025PhaseNot applicableConditionsDepression and bipolar disorder, Sleep and sleep disorders, Anxiety, PTSD and OCDParticipants67Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestSecondary8 weeks
  • Stroop Color-Word TestSecondary8 weeks
NCT07393672Start2026PhasePhase 2ConditionsAnxiety, PTSD and OCD, Pain and fatigueParticipants104Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary13 weeks
  • Stroop Color-Word TestSecondary13 weeks
  • Verbal LearningSecondary13 weeks
  • Verbal FluencySecondary13 weeks
  • Digit Span TestSecondary13 weeks
  • Symbol CodingSecondary
  • N-Back TaskSecondary13 weeks
  • Go/No-Go TaskSecondary13 weeks
  • Simple Reaction TimeSecondary13 weeks
  • Corsi Block-Tapping TestSecondary13 weeks
NCT07309302Start2025PhaseNot applicableConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants64Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary5 months
  • Stroop Color-Word TestPrimary5 months
  • Verbal LearningPrimary5 months
  • Verbal FluencyPrimary5 months
  • Symbol CodingPrimary5 months
  • Continuous Performance TestPrimary5 months
  • Category FluencyPrimary5 months
  • Eriksen Flanker TaskPrimary5 months
  • Balloon RiskPrimary5 months
  • Emotional Stroop TaskPrimary5 months
  • Visual Search TestPrimary5 months
  • Serial Naming TaskPrimary5 months
NCT06885996Start2026PhasePhase 2ConditionsAnxiety, PTSD and OCDParticipants76Lead sponsorOtherStatusNot yet recruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Digit Span TestSecondary6 months
  • Card Sorting Test (Berg)Secondary6 months
  • Choice Reaction TimeSecondary6 months
NCT06831916Start2025PhasePhase 2ConditionsAnxiety, PTSD and OCD, Pain and fatigueParticipants104Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestSecondary13 weeks
  • Stroop Color-Word TestSecondary13 weeks
  • Verbal LearningSecondary13 weeks
  • Verbal FluencySecondary13 weeks
  • Digit Span TestSecondary13 weeks
  • Symbol CodingSecondary
  • N-Back TaskSecondary13 weeks
  • Go/No-Go TaskSecondary13 weeks
  • Simple Reaction TimeSecondary13 weeks
  • Corsi Block-Tapping TestSecondary13 weeks
  • DRM False Memory TaskSecondary13 weeks
NCT06804629Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants68Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestSecondarysame day
  • Stroop Color-Word TestSecondarysame day
NCT06777693Start2024PhaseNot applicableConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants24Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary
  • Stroop Color-Word TestPrimary
NCT06769243Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants30Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestPrimary4 weeks
  • Verbal FluencyPrimary4 weeks
  • Category FluencyPrimary4 weeks
  • Card Sorting Test (Berg)Primary4 weeks
  • Task Switching TestPrimary4 weeks
NCT06569849Start2024PhaseNot applicableConditionsAnxiety, PTSD and OCD, Pain and fatigueParticipants60Lead sponsorIndustryStatusStatus unknownLibrary tests named
  • Trail Making TestPrimary9 weeks
  • Digit Span TestPrimary9 weeks
  • Complex Figure Copy and RecallPrimary9 weeks
NCT06542419Start2024PhaseNot applicableConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants24Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestPrimary1 week
  • Digit Span TestPrimary1 week
  • Symbol CodingPrimary1 week
NCT06429956Start2024PhaseNot applicableConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants93Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestOther outcomesame day
  • Stroop Color-Word TestOther outcomesame day
  • Verbal FluencyOther outcomesame day
  • Digit Span TestOther outcomesame day
NCT06273527Start2024PhasePhase 2/3ConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants128Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary16 weeks
  • Digit Span TestSecondary16 weeks
  • Matrix ReasoningSecondary16 weeks
  • Dimensional Change Card SortSecondary16 weeks
  • Vocabulary TestSecondary16 weeks
  • Size Order Memory TestSecondary16 weeks
  • Pattern and Letter ComparisonSecondary16 weeks
  • Picture Order Memory TestSecondary16 weeks
  • Reading Span TaskSecondary4 weeks
NCT06236919Start2024PhaseNot applicableConditionsDepression and bipolar disorder, Anxiety, PTSD and OCDParticipants160Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary5 weeks
  • Stroop Color-Word TestSecondary5 weeks
  • Digit Span TestSecondary5 weeks
  • Card Sorting Test (Berg)Secondary5 weeks
NCT06063265Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants120Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestPrimary6 months
  • Verbal FluencyPrimary6 months
  • Digit Span TestPrimary6 months
  • Category FluencyPrimary6 months
NCT06032377Start2023PhaseNot applicableConditionsDepression and bipolar disorder, Sleep and sleep disorders, Anxiety, PTSD and OCDParticipants275Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestSecondary6 months
  • Stroop Color-Word TestSecondary6 months
  • Verbal LearningSecondary6 months
  • Verbal FluencySecondary6 months
  • Digit Span TestSecondary6 months
  • Symbol CodingSecondary6 months
  • Picture Naming TestSecondary6 months
  • Short Story RecallSecondary6 months
  • Paired Associate LearningSecondary6 months
  • Rapid Visual Information ProcessingSecondary6 months
  • Intra/Extra Dimensional Set ShiftPrimary6 months
  • Pattern Recognition MemorySecondary6 months
NCT05967962Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants248Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestSecondary
NCT05964062Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants30Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Trail Making TestSecondary5 days
  • Stroop Color-Word TestSecondary5 days
  • Verbal LearningSecondary5 days
NCT05964049Start2023PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants30Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Trail Making TestSecondary2 weeks
  • Stroop Color-Word TestSecondary2 weeks
  • Verbal LearningSecondary2 weeks
NCT05793736Start2023PhaseNot applicableConditionsDepression and bipolar disorder, COVID-19 and long COVID, Anxiety, PTSD and OCD, Pain and fatigueParticipants17Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestPrimary9 weeks
  • Stroop Color-Word TestPrimary9 weeks
  • Digit Span TestPrimary9 weeks
NCT05760729Start2021PhaseObservationalConditionsMild cognitive impairment, Depression and bipolar disorder, Anxiety, PTSD and OCDParticipants75Lead sponsorOtherStatusStatus unknownLibrary tests named
  • Trail Making TestPrimary
  • Digit Span TestPrimary
  • Symbol CodingPrimary
NCT05595421Start2019PhaseNot applicableConditionsAnxiety, PTSD and OCDParticipants18Lead sponsorOtherStatusCompletedLibrary tests named
  • Trail Making TestSecondary2 weeks
  • Stroop Color-Word TestSecondary2 weeks
  • Symbol CodingSecondary2 weeks
  • Tower PlanningSecondary2 weeks
NCT05289258Start2021PhaseNot applicableConditionsDepression and bipolar disorder, Cancer, Anxiety, PTSD and OCDParticipants123Lead sponsorOtherStatusRecruitingLibrary tests named
  • Trail Making TestPrimary
  • Verbal LearningPrimary
  • Verbal FluencyPrimary

Page 1 of 3

Questions, answered from the data

How many anxiety, PTSD and OCD trials use the Trail Making Test?

69 registered anxiety, PTSD and OCD studies on ClinicalTrials.gov name it in an outcome measure, 24 of them in a primary outcome: 10% of the condition's 692 studies with a cognitive outcome, against 14% of all of them. It is the 4th most named test in anxiety, PTSD and OCD trials.

Which tests do anxiety, PTSD and OCD trials use with the Trail Making Test?

The Digit Span Test (30 studies), Verbal Fluency (27 studies) and Verbal Learning (22 studies).

When do anxiety, PTSD and OCD trials measure the Trail Making Test?

Half of the primary outcomes that name the Trail Making Test are measured within 13 weeks of the start, and the middle half from 5 weeks to 6 months. 21 primary outcomes give a duration.

How many completed anxiety, PTSD and OCD trials that use the Trail Making Test have reported results?

15 of the 34 completed studies that name it, 44%, have reported results: 11 posted them on ClinicalTrials.gov, 7 have a results paper linked to the registry record, and 3 did both. The other 19 show neither. Of all completed studies with a cognitive outcome, 46% have reported results.

More on the Trail Making Test and anxiety, PTSD and OCD

  • Every cognitive test in anxiety, PTSD and OCD trials: 692 studies
  • The Trail Making Test in all clinical trials: 2,293 studies

The Trail Making Test in other conditions

  • Dementia and Alzheimer's273
  • Aging, frailty and exercise255
  • Mild cognitive impairment213
  • Depression and bipolar disorder204
  • Cancer187
  • Parkinson's disease156
  • Stroke156
  • Brain injury and concussion115
  • Cardiovascular disease105
  • Obesity and diabetes102
  • Schizophrenia and psychosis102
  • Pain and fatigue94
  • Sleep and sleep disorders85
  • Cognitive impairment and decline77
  • Delirium, surgery and intensive care69
  • Healthy volunteers68
  • Substance use and addiction52

Other tests in anxiety, PTSD and OCD trials

  • Stroop Color-Word Test79
  • Digit Span Test72
  • Verbal Learning70
  • Go/No-Go Task63
  • Verbal Fluency61

How the studies are counted

For each test family, the census runs ClinicalTrials.gov's own outcome search for the family's names and reads every study first posted by the day the family was counted. These studies were read on 10 November 2026. A study counts once on a page, however many tests it names. Counts for a test cover every version of the task under any of its names, so a page can count studies that used a commercial version.

The census adds two things to each record and changes nothing in it: which outcome list names the test (primary, then secondary, then other), and the condition groups, matched on the study's condition names and MeSH terms. A study can fall in several groups; one whose only condition is cognitive impairment or decline falls in “Cognitive impairment and decline”. Studies that name only instruments outside the library count in every total and share but are not listed.

A second read on 10 November 2026 added each study's overall status, whether results are posted, its intervention types, the countries of its sites and the time frame of the outcome that names each test. A time frame counts by the latest time point it names: “Baseline, 12 and 24 weeks” is 24 weeks, a single visit is within a day, and one that names no duration, such as “end of treatment”, is left out of the timings.

A third read on 10 November 2026 added the papers the registry links to each study: those its sponsor lists as reporting results, and those PubMed links to it through the study's NCT number. A study has a results paper when one of them came out in or after the month of its primary completion and PubMed does not class it as a protocol, review or comment. A paper that never gives the NCT number is not linked, so some studies counted as reporting neither did publish.

Source: ClinicalTrials.gov, a database of the U.S. National Library of Medicine, which does not endorse these pages. Every study line is in the data release 2.1.0, and the explorer's own file is clinical-trials-studies.json.

The census counts Trail Making Test A and Trail Making Test B as one test family, so this page counts their studies together.

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